personnel can use the technology to track projectiles in space. >>> the new leader of t chinese communist party is sending out mixed signals. xi jinping says he wants to pursue a peaceful foreign policy. at the same time, china is locked in territorial disputes with japan and several southeast asian nations over islands in the east and south china seas. xi told a group of foreign academics in beijing that china poses neither a challenge nor a threat. >> translator: looking at china's history, cultural traditions, and current conditions, china will never adopt a policy of dominance or expansionism. ouprperityill bring peace and will benefit the rest of the world. >> analysts say xi hopes to ease concerns that china's new leadership intends to adopt a hard-line stance on diplomacy. however, on the same day he told a senior military commander to prepare strong missile units for possible conflict. >>> lawmakers in the u.s. senate have offered japanese government officials reassurance on the senkaku island. they unanimously approved a key defense bill stating the u.s. is covered by the u.s./ja